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wind profiling Articles

The horizontally homogeneous atmospheric boundary layer over rough surface with a large roughness length z0 is introduced to model the simplest cases of the Urban Planetary Boundary Layer (UABL) over the flat plain. The system of the equations of motion was non-dimensionalised and it has been demonstrated that the Rossby number similarity exists for the core of the UABL. That means that the ...

Wind is a variable resource, but not an indecipherable one. Second Wind encourages harnessing the full range of wind sensing technologies that are available today. When it comes to wind information, much attention is focused on the choice of wind measurement technology and data collection practices in wind resource assessment and project design. Right now, wind data plays a limited role in the ...

In the framework of COST-710, working group III aims to recommend formulations of atmospheric vertical profiles of wind, temperature and turbulence. This intermediate report gives a brief overview of existing methods to calculate vertical profiles. A short note on existing datasets for validation purposes is given.Keywords: atmospheric turbulence, turbulence time-, scale, vertical profiles, ...

Although computer models of wind flow over terrain have improved dramatically in the past few years, there is still no substitute for data recorded at the site. So you want to build a wind farm. Good for you. With the global drive towards a low carbon economy, it is surely the right way to go for many individuals, companies and, indeed, Governments around the world. As information from the ...

This study presents a comparative evaluation of the prognostic meteorological Fifth Generation NCAR Pennsylvania State University Mesoscale Model (MM5) using data from the Northeast Oxidant and Particle Study (NE-OPS) research program collected over Philadelphia, PA during a summer episode in 1999. A set of model simulations utilizing a nested grid of 36 km, 12 km and 4 km horizontal resolutions ...

Introduction In the late 1990’s wind turbines with nacelle heights exceeding 60 meters were introduced to the wind energy community. Initially, wind prospecting and siting studies continued to use 50-meter wind towers and extrapolate the measurement to the nacelle heights. It was quickly determined that this approach was not sufficient for the placement of these tall turbines. The next ...

We observed the turbulence and vertical profile of temperature in and above the roughness sublayer (RS) using a tower, a tethered balloon and a Doppler sodar in Himeji City. A 3–D ultrasonic anemometer–thermometer was sited at a height of 54 m on the tower. The present results showed that in the RS, the ratio of friction velocity to wind speed, u* /u, observed under unstable ...

In summertime a temperature stratification occurs in deep lakes – the surface water is warm, but deep down the water is cold. This has considerable influence on the nutrient balance and the biological habitat in these lakes. Due to generally higher air temperatures induced by the climate change, both change and have effects on the life conditions of the ecosystems in the lakes. ...

Solar Power Solutions A noise monitoring terminal’s (NMT) low power consumption and its ability to operate fully without power hungry cooling and heating units inside its enclosure mean that it is suitable for power from solar panels. The NMT may be continuously powered by battery which in turn is kept charged via solar energy. This solution is most appropriate in areas where there ...

A simple two-layer model of convective planetary boundary layer (CPBL), consisting of a Surface Layer and an Ekman layer over it and developed in accordance with the similarity theory is used to obtain the vertical profiles of the temperature, wind velocity and the turbulent exchange coefficient in CPBL from the surface wind measurements and atmospheric stability data. As input to this model the ...

The LI-8100 Automated Soil CO2 Flux System has been designed to help answer the spatial and/or temporal variability questions that arise when performing soil CO2 flux measurements. When using the LI-8150 Multiplexer with the LI-8100 Analyzer Control Unit, atmospheric CO2 profile measurements can be performed in addition to soil CO2 flux measurements, with minimal added cost. This application note ...

CTDefluorescenceeturbidity profiles from two surveys conducted in June and September 1997 were examined in order to evaluate the influence of the predictable fortnightly (spring/neap) tidal cycle and the less predictable wind on the phytoplankton distribution in the Strait of Gibraltar. The injection of the nutrient-rich North Atlantic Water (NACW) in the Atlantic inflowing current is associated ...

Wind flow and pollutant dispersion within urban areas depend on the approaching flow profile and temperature stratification. Thus, the flow field developed under neutral and unstable stratification conditions, within a street–canyon, was studied experimentally and numerically for a two–dimensional urban background set–up. Wind–tunnel measurements were carried out with a triple hot sensor ...

1 Introduction Experiments were conducted in a simulated boundary layer representative of rural terrain with a few shrubs and trees in neutral conditions. Vertical profiles of concentration were measured downstream of a rectangular building for various stack heights, emission characteristics and building positions. The model scale in the wind tunnel was 1/200 of full scale. Full ...

This paper studies the impact on the voltage profile of wind energy based generators connected to distribution power systems. Voltage fluctuations arise in distribution levels including noncontrollable primary energy sources because of their corresponding active power injection variations. A number of reactive power strategies have been analysed and compared focusing on the voltage fluctuation ...

RnRMarketResearch.com adds “Solar PV in The US, Market Outlook to 2025, Update 2014 – Capacity, Generation, Levelized Cost of Energy, Equipment Market, Regulations and Company Profiles” report to its research database. The report provides an in-depth analysis on global renewable power market and global solar PV market with forecasts up to ...

Spremberg Reservoir is a small and shallow water body where wind sheltering along steep and densely vegetated sections of the shoreline is expected to produce small-scale inhomogeneities of the wind field across the water surface. The potential impacts of these inhomogeneities on the quasi-steady circulation in the main subbasin of the reservoir are investigated in this study by means of a ...

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